Digital hearing aid echo canceling method based on NLMS algorithm improvement

An echo cancellation and hearing aid technology, applied in hearing aids, electrical components, etc., can solve the problems of increased program jump frequency, high real-time requirements of algorithms, and increased computational complexity, so as to reduce computational complexity and meet real-time requirements. and accuracy requirements, avoiding computationally intensive effects

Inactive Publication Date: 2015-07-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, due to the fact that updating all coefficients point by point increases the computational complexity, which increases the program jump frequency, and the hearing aid echo cancellation requires high real-time performance of the algorithm. Therefore, it is necessary to improve the NLMS algorithm to meet the actual real-time performance requirements.

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  • Digital hearing aid echo canceling method based on NLMS algorithm improvement
  • Digital hearing aid echo canceling method based on NLMS algorithm improvement
  • Digital hearing aid echo canceling method based on NLMS algorithm improvement

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0014] The method of the present invention simulates and estimates the external echo path, uses the difference between the microphone input signal and the filter output to modify the next filter coefficient, and repeats the above process when the next data enters. By controlling the step size and updating the coefficient position, iteratively until the algorithm converges, the filter output is similar to the external echo, so as to achieve the purpose of eliminating the echo in real time.

[0015] attached figure 1 It is a flow chart of the realization of the method of the present invention, and t...

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Abstract

The invention discloses a digital hearing aid echo canceling method based on NLMS algorithm improvement. The digital hearing aid echo canceling method based on the NLMS algorithm improvement mainly includes that each input data in an M-size block updates N/M coefficients of interval M, after inputting M data, all the coefficients of an adaptive filter are updated. Good convergence rate and steady state error are guaranteed through controlling the upper limit and lower limit of step size normalization. The digital hearing aid echo canceling method based on the NLMS algorithm improvement is capable of realizing the hearing aid echo canceling, lowering the computation complexity of the algorithm, guaranteeing the controllability of the algorithm performance and meeting the timeliness and precision demands of a hearing aid.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to an echo cancellation method for a digital hearing aid. Background technique [0002] The traditional NLMS (Normalized Least Mean Square) algorithm is an adaptive algorithm based on the improvement of the LMS algorithm. It is simple to implement and reduces the impact of the input signal amplitude on the performance of the algorithm by normalizing the energy. It has high robustness and low steady-state error. Small. However, due to the fact that updating all the coefficients point by point increases the computational complexity, the program jump frequency increases, and the echo cancellation of the hearing aid has high requirements for the real-time performance of the algorithm. Therefore, it is necessary to improve the NLMS algorithm to meet the actual real-time requirements. Contents of the invention [0003] In order to solve the problems in the prior art, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00
Inventor 樊滨温张健王明江刘明蒋贤慧王兆阳曹彬曾伟浩
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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